Icahn, Ackman in Epic Showdown of Billionaires

Saturday marks one year since Carl Icahn and Bill Ackman brawled on "Fast Money Halftime Report" over Herbalife. The FMHR traders discuss news Sen. Ed Markey (D-MA) is launching an investigation into Herbalife.

Call them the "Bickering Billionaires," two financial titans who squared off in a breathtaking, unforgettable smackdown Friday on CNBC.

Bill Ackman, the head of Pershing Square Capital Management and its $12 billion in assets, squared off against Carl Icahn, the fellow activist investor and one of the richest men in America with an estimated fortune of nearly $15 billion.

The debate revolved around charges and countercharges, with Icahn calling Ackman dishonest and "a major loser," while Ackman countered that Icahn is a bully "not used to someone standing up to him."

Traders at the New York Stock Exchange punctuated the air with "oohs" and "aahs" during the arguing, while social networks lit up, with financial journalists and market watchers tweeting and posting as fast as their fingers could type. (Read More: Ackman: Icahn Wanted to Be My Friend, I Said No)

The setting was during the final half-hour of CNBC's "Fast Money Halftime Report" with Scott Wapner, who found himself as much of the story as the two participants.

Icahn repeatedly berated Wapner. Icahn insisted he was the one being bullied and on several occasions used the word "bullsh--" to describe his feelings about the on-air forum.